Knee joint surgery distraction device

Abstract

The present invention discloses a distraction device for knee joint surgery, comprising two distraction arms connected in rotation, distraction plates are provided at the ends of the two distraction arms, the distraction plates include a first distraction piece, the first distraction piece is rotatably connected to the distraction arm to adjust the distraction angle of the skin and flesh on both sides of the knee joint, a second distraction piece is provided at the edge of the first distraction piece, the cross-sectional size of the second distraction piece is smaller than the cross-sectional size of the first distraction piece, and the second distraction piece can be extended into the knee joint incision to distract the collateral ligament. The first distraction piece and the second distraction piece of the present invention can be extended longitudinally into the knee joint incision, the two first distraction pieces can distract the skin and flesh on both sides of the knee joint at different angles, and the two second distraction pieces can distract the collateral ligaments on both sides of the knee joint, which can fully reveal the surgical field of view, effectively avoid interference from the tissue of the knee joint incision, provide good surgical space for doctors, and ensure the surgical effect.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a distraction device for knee joint surgery. Background Art

[0002] The knee joint is one of the more important joints in the human body. Knee joint lesions will seriously affect the patient's mobility and reduce their quality of life. With the extension of the average life expectancy of the Chinese population, the incidence of degenerative osteoarthritis of the knee has shown a clear increasing trend in the elderly population. Among the outpatients of joint specialists, patients who visit for knee OA (knee osteoarthritis) account for a considerable proportion of the outpatient volume. In the past, the treatment of such diseases mainly relied on various non-steroidal anti-inflammatory drugs, but such drugs are often ineffective for severe cases. For severely degenerated knee joints, how to maximize the reconstruction of knee joint function and improve the quality of life of patients is a major problem facing orthopedic surgeons.

[0003] Knee replacement is such a joint function reconstruction surgery. Knee replacement is one of the commonly used surgical methods for the treatment of knee osteoarthritis, traumatic arthritis, rheumatoid arthritis and other diseases in clinical practice, and its postoperative effect is good. At present, when doctors perform knee surgery, they first need to cut the surface of the knee joint. After the incision, the skin and flesh on both sides of the knee joint are relatively loose, and medical staff need to use a pry board to spread the skin and flesh on both sides. In addition, when performing knee osteotomy during surgery, a pry board is needed to slightly spread the collateral ligament to protect the collateral ligament. During this operation, medical staff need to hold the pry board to protect the soft tissue and collateral ligament. Generally, a surgery requires multiple use of the pry board, and multiple medical staff are required to cooperate in the operation, which will make the operating table crowded and affect the operation of the surgeon; in addition, the knee surgery process is often long, and the pry board needs to be used frequently and for a long time to protect the soft tissue and collateral ligament during the operation. There is a possibility that the pry board will fall due to mistake, affecting the progress of the operation. Summary of the invention

[0004] The purpose of the present invention is to provide a knee joint surgery distraction device to solve the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a knee joint surgical distraction device, comprising two rotatably connected distraction arms, each end of the two distraction arms being provided with a distraction plate, the distraction plate comprising a first distraction piece, the first distraction piece being rotatably connected to the distraction arm to adjust the distraction angle of the skin and flesh on both sides of the knee joint, a second distraction piece being provided at the edge of the first distraction piece, the cross-sectional size of the second distraction piece being smaller than the cross-sectional size of the first distraction piece, and the second distraction piece being able to extend into the knee joint incision to distract the collateral ligament.

[0006] As an optional implementation scheme of the present invention, both the first opening piece and the second opening piece are in an arc shape convex outward.

[0007] As an optional embodiment of the present invention, a clamping groove is provided at the end of the spreading arm, and one end of the first spreading piece extends into the clamping groove and is rotatably connected to the spreading arm through a rotatable connecting member.

[0008] As an optional embodiment of the present invention, the rotating connecting member includes an adjusting screw, which passes through the first spreading piece and is threadedly connected to the spreading arm.

[0009] As an optional embodiment of the present invention, the expansion arm includes a handle portion, an arm body portion and a connecting portion which are connected in sequence, the handle portion is provided with a finger ring, and the connecting portion is rotatably connected to the first expansion piece.

[0010] As an optional embodiment of the present invention, the connecting portion is rotatably connected to the arm body portion via a connecting screw, and a rotation plane of the connecting portion is in the same plane as a rotation plane of the first spreading piece.

[0011] As an optional embodiment of the present invention, a locking mechanism is provided between the two spreading arms, and the locking mechanism is used to lock the relative positions of the two spreading arms.

[0012] As an optional embodiment of the present invention, the locking mechanism includes a locking spring and an arc-shaped ratchet piece, the ventral side of the ratchet piece is provided with a ratchet, and the dorsal side of the ratchet piece is provided with a slot, the locking spring and the ratchet piece are both rotatably set on an open arm, and a ratchet hole is opened on the other open arm, the ratchet piece passes through the ratchet hole and extends to the outside of the open arm, and the locking spring can be extended into the slot to fix the ratchet piece.

[0013] The beneficial effects of the present invention are:

[0014] The present invention provides a knee joint surgery distraction device, wherein a second distraction piece is provided on the edge of a first distraction piece, the first distraction piece is rotatably connected to a distraction arm, and the two first distraction pieces are arranged relative to each other, so that the two first distraction pieces can distract the skin and flesh on both sides of the knee joint at different angles. The first distraction piece and the second distraction piece can be longitudinally extended into the knee joint incision, the two first distraction pieces can distract the skin and flesh on both sides of the knee joint at different angles, and the two second distraction pieces can distract the collateral ligaments on both sides of the knee joint, which can fully reveal the surgical field of view, effectively avoid interference from the tissue of the knee joint incision, provide doctors with a good surgical space, and ensure the surgical effect. The present invention can fully expose the knee joint without the need for medical personnel to use a pry plate, thus avoiding possible mistakes caused by frequent and long-term use of the pry plate, and can effectively protect the soft tissue and collateral ligaments of the knee joint, greatly improving the working efficiency of knee replacement surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a three-dimensional structure of an embodiment of the present invention;

[0016] Figure 2 It is a front structural schematic diagram of an embodiment of the present invention;

[0017] Figure 3 It is a side structural schematic diagram of an embodiment of the present invention.

[0018] In the figure: 1-spreading arm; 2-spreading plate; 3-first spreading piece; 4-second spreading piece; 5-adjusting screw; 6-handle; 7-arm body; 8-connecting part; 9-finger ring; 10-connecting screw; 11-locking spring; 12-ratchet piece; 13-ratchet hole; 14-fastening screw. DETAILED DESCRIPTION

[0019] Example

[0020] like Figure 1-Figure 3 As shown, a knee joint surgical distraction device provided in this embodiment includes two rotatably connected distraction arms 1, and the middle parts of the two distraction arms 1 can be rotatably connected by a fastening screw 14, and the fastening screw 14 can adjust the tightness of the rotation of the two distraction arms 1. A distraction plate 2 is provided at the end of the distraction arm 1, and the two distraction plates 2 are arranged relative to each other, so as to facilitate distraction of the tissues of the knee joint. Specifically, the distraction plate 2 includes a first distraction piece 3, and the first distraction piece 3 is rotatably connected to the distraction arm 1, and the first distraction piece 3 can be rotated to facilitate adjustment of the distraction angle of the skin and flesh on both sides of the knee joint. The two first distraction pieces 3 are arranged relative to each other, so that the two first distraction pieces 3 can distract the skin and flesh on both sides of the knee joint at different angles.

[0021] The bottom edge of the first stretching piece 3 is provided with a second stretching piece 4, the cross-sectional size of the second stretching piece 4 is smaller than the cross-sectional size of the first stretching piece 3, and the second stretching piece 4 can be inserted into the knee joint incision to stretch the collateral ligament. The second stretching piece 4 is located at the bottom of the first stretching piece 3, the first stretching piece 3 is used to stretch the skin and flesh on both sides of the knee joint, and the second stretching piece 4 is used to stretch the collateral ligament of the knee joint. The knee joint surgical stretching device can directly stretch the collateral ligament and soft tissues such as skin and flesh in the knee joint incision, which can reveal the surgical field of view and provide a good surgical space for doctors.

[0022] The first spreading piece 3 and the second spreading piece 4 of the present invention can be extended longitudinally into the knee joint incision. The two first spreading pieces 3 can spread the skin and flesh on both sides of the knee joint at different angles, and the two second spreading pieces 4 can spread the collateral ligaments on both sides of the knee joint, which can fully reveal the surgical field, effectively avoid the interference of the knee joint incision tissue, and ensure the surgical effect. The present invention can fully expose the knee joint without the need for medical personnel to use a pry plate, avoids the mistakes that may occur due to frequent and long-term use of the pry plate, and can effectively protect the soft tissue and collateral ligaments of the knee joint, greatly improving the working efficiency of knee replacement surgery.

[0023] like Figure 1 As shown, as an optional technical solution of this embodiment, the first expansion piece 3 and the second expansion piece 4 are both in an arc shape convex outward. The first expansion piece 3 and the second expansion piece 4 are both convex outward and in an outward shape, which is conducive to expanding the surgical field of view.

[0024] The end of the spreading arm 1 is provided with a clamping groove, one end of the first spreading piece 3 extends into the clamping groove and is rotatably connected to the spreading arm 1 through a rotating connector. The clamping groove is U-shaped, and the side wall of the clamping groove is provided with a through hole, and a rotating connector is provided in the through hole. One end of the first spreading piece 3 extends into the clamping groove, and the rotating connector penetrates the first spreading piece 3, so that the first spreading piece 3 can rotate up and down, which is convenient for adjusting the position of the first spreading piece 3 and the second spreading piece 4, so that the two first spreading pieces 3 can spread the skin and flesh on both sides of the knee joint at different angles, so as to better complete the knee joint surgery.

[0025] Specifically, the rotating connecting member includes an adjusting screw 5, and the through hole of the side wall of the clamping groove is a threaded hole. The adjusting screw 5 passes through the first opening piece 3 and is threadedly connected to the threaded hole of the opening arm 1. By adjusting the tightness of the adjusting screw 5, the tightness of the rotation of the first opening piece 3 can be adjusted. When the angle of the first opening piece 3 needs to be adjusted, the adjusting screw 5 can be loosened, the first opening piece 3 is rotated to a suitable angle, and then the adjusting screw 5 is tightened to keep the angle of the first opening piece 3 fixed. The rotation angles of the two first opening pieces 3 can be adjusted as needed, which can more conveniently complete the operation.

[0026] like Figure 2 As shown, in this embodiment, the expansion arm 1 includes a handle portion 6, an arm body portion 7 and a connecting portion 8 connected in sequence, the handle portion 6 is provided with a finger ring 9, and the connecting portion 8 is rotatably connected to the first expansion piece 3. The arm body portion 7 is an arc-shaped structure that expands outward, and the connecting portion 8 is a straight line. The handle portion 6, the arm body portion 7 and the connecting portion 8 are connected to form the expansion arm 1. The user's finger passes through the finger ring 9 to control the opening angle of the two expansion arms 1 and adjust the position of the first expansion piece 3 and the second expansion piece 4, thereby expanding the surgical field of view.

[0027] like Figure 3As shown, the connecting portion 8 is rotatably connected to the arm body 7 through a connecting screw 10, and the rotation plane of the connecting portion 8 is the same plane as the rotation plane of the first opening piece 3. By adjusting the locking state of the connecting screw 10, the tightness of the rotation of the connecting portion 8 can be adjusted. The connecting portion 8 has a certain length. When the connecting portion 8 rotates, the first opening piece 3 and the second opening piece 4 rotate together with the connecting portion 8, so that a large angle adjustment of the first opening piece 3 and the second opening piece 4 can be achieved; when the first opening piece 3 rotates, the second opening piece 4 rotates together with the first opening piece 3, so that a small angle adjustment of the first opening piece 3 and the second opening piece 4 can be achieved.

[0028] In this embodiment, a locking mechanism is provided between the two spreading arms 1, and the locking mechanism is used to lock the relative position of the two spreading arms 1, and the opening angle of the two spreading arms 1 is kept fixed, and the spreading can spread the skin and collateral ligaments on both sides of the knee joint, so as to facilitate surgery. In actual application, after the opening angle of the two spreading arms 1 is kept fixed, the knee joint surgery spreading device can be fixed to the patient's leg with medical tape or other methods to improve the doctor's work efficiency.

[0029] Specifically, the locking mechanism includes a locking spring 11 and an arc-shaped ratchet piece 12, wherein the ventral side of the ratchet piece 12 is provided with ratchets, and the dorsal side of the ratchet piece 12 is provided with a slot. The locking spring 11 and the ratchet piece 12 are both rotatably arranged on one of the spreading arms 1, and a ratchet hole 13 is provided on the other spreading arm 1. The ratchet piece 12 passes through the ratchet hole 13 and extends to the outside of the spreading arm 1, and the locking spring 11 can extend into the slot to fix the ratchet piece 12. The locking spring 11 is rotatably mounted on the spreading arm 1 through a positioning pin, and the ratchet piece 12 is rotatably mounted on the spreading arm 1 through another positioning pin. The ratchet on the ventral side of the ratchet piece 12 contacts the inner wall of the ratchet hole 13, and the slot on the dorsal side of the ratchet piece 12 presses against the locking spring 11, so that the opening angle of the two spreading arms 1 can be kept fixed. When it is necessary to adjust the opening angle of the two spreading arms 1, rotate the locking spring piece 11 to disengage the locking spring piece 11 from the slot on the back side of the ratchet piece 12, and then rotate the ratchet piece 12 to separate the ratchet on the ventral side of the ratchet piece 12 from the inner wall of the ratchet hole 13. The two spreading arms 1 lose their locking function, and the opening angle of the two spreading arms 1 can be adjusted as needed to facilitate better surgery.

[0030] It should be noted that the components of the distraction arm 1, distraction plate 2, first distraction piece 3, second distraction piece 4, adjustment screw 5, finger ring 9, connecting screw 10, locking spring piece 11, ratchet piece 12, ratchet hole 13 and fastening screw 14 in the distraction device for knee joint surgery of the present invention are all components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods. The problem solved by the present invention is that when doctors perform knee joint surgery, medical personnel need to use pry plates to protect soft tissues and collateral ligaments, which is troublesome to operate, and the pry plates may fall off, affecting the progress of the operation. The present invention combines the above components with each other, and the structural design is novel and reasonable, the scope of use is wide, the operation is convenient, the distraction effect is good, and the surgical operation is greatly facilitated, the surgical speed and quality are improved, and the work efficiency of doctors is improved.

[0031] In the description of the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. Under the condition that there is no contradiction, those skilled in the art may combine the features of different embodiments. The protection scope of the present invention is not limited to the above-mentioned specific examples. According to the basic technical concept of the present invention, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention.

Claims

1. A knee joint surgery distraction device, characterized in that: The invention comprises two rotatably connected spreading arms (1), the ends of the two spreading arms (1) are each provided with a spreading plate (2), the spreading plate (2) comprising a first spreading piece (3), the first spreading piece (3) being rotatably connected to the spreading arm (1) so as to adjust the spreading angle of the skin and flesh on both sides of the knee joint, the edge of the first spreading piece (3) is provided with a second spreading piece (4), the cross-sectional dimension of the second spreading piece (4) is smaller than the cross-sectional dimension of the first spreading piece (3), and the second spreading piece (4) can be extended into the knee joint incision to spread the collateral ligament; the first spreading piece (3) and the second spreading piece (4) are both in an arc shape convex outwards; The spreading arm (1) comprises a handle portion (6), an arm body portion (7) and a connecting portion (8) which are connected in sequence, the handle portion (6) being provided with a finger ring (9), and the connecting portion (8) being rotatably connected to the first spreading piece (3); the connecting portion (8) being rotatably connected to the arm body portion (7) via a connecting screw (10), and the rotation plane of the connecting portion (8) and the rotation plane of the first spreading piece (3) being the same plane.

2. The knee joint surgical distraction device according to claim 1, characterized in that: A clamping groove is provided at the end of the spreading arm (1), and one end of the first spreading piece (3) extends into the clamping groove and is rotatably connected to the spreading arm (1) via a rotatable connecting piece.

3. The knee joint surgical distraction device according to claim 2, characterized in that: The rotating connection member comprises an adjusting screw (5), wherein the adjusting screw (5) passes through the first opening piece (3) and is threadedly connected to the opening arm (1).

4. The knee joint surgical distraction device according to claim 1, characterized in that: A locking mechanism is provided between the two spreading arms (1), and the locking mechanism is used to lock the relative position of the two spreading arms (1).

5. The knee joint surgery distraction device according to claim 4, characterized in that: The locking mechanism comprises a locking spring (11) and an arc-shaped ratchet piece (12), wherein the ventral side of the ratchet piece (12) is provided with ratchets, and the dorsal side of the ratchet piece (12) is provided with a slot, wherein the locking spring (11) and the ratchet piece (12) are both rotatably arranged on one of the spreading arms (1), and a ratchet hole (13) is provided on the other spreading arm (1), wherein the ratchet piece (12) passes through the ratchet hole (13) and extends to the outside of the spreading arm (1), and the locking spring (11) can extend into the slot to fix the ratchet piece (12).

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